Dental impression device



Oct. 16, 1928. 1,687,914

J. O wlLDER. JR

DENTAL IMPRES S ION DEVICE Filed Oct. 50, 1926 INVENTOR @amw'o m ATTORNEY Patentedfict. 16, 1928.

UNITED? STATES? PATENT OFFICE.

JOEL o. wILDEn, 1a., or amuse, CALIFORNIA.

DENTAL mrREssIoN: 3mm.

Application filed October so, 192s. Serial at; 145,108.

This invention relates to improvements in dental impression devices and more particularly to compression means for holdin and compressing a plastic composition for taking dental impressions. 7 i l In the practice of dentistry, particularlythese impressions, not only of the immediate toothinvolved but also. of surrounding dental conditions vfor the guidance ot the opera tor 1n aocomphshing accurate replacement with perfect occlusions of the permanent tooth with the replacement. I

Heretofore it has been the practice .to introduce a lump of plastic compound between the jaws of the patient, having him bite down thereinto, thereby leaving an impression of the teeth involved. This method is crude and faulty in that, theplastie material in flowing away from thebite is distorted and does not leave a true impression, with the possible exception ofthe occlusive portions of the teeth. Furthermore in removing the compound from the patients mouth it is very apt to become distorted in detaching it from the teeth to which it may adhere, or by the general handling by the operator. It has also been the practice where a small area was involved, such as, merely the occlusive surface of one tooth, to surround the opposite tooth with a girdle of metal, having the impression compound therein and have the patient bite/down thereinto. more or less of a make-shift method, resulting in distorted or untrue impressions, and

gives no impression of the adjacent teeth for accurate replacement as in bridge-work.

The principal object of this invention is to provide means that will mechanically hold the mass 01 plastic impression material for first placement and subsequent handling and also to provide means for compressing the plastic laterally during the period or immediately following the bite of the patient into the plastic mass before it hardens, the

purpose being to perfect the lateral impre ssion of the teeth involved so as to get a true impression and maintain the same. objects and advantages will appear as this description progresses.

in this specification and the annexed This likewise, is.

Other drawings Itheinvention is illustrated .the v form considered to be the best, but it is to be understood that the invention is not limited to such form because it may be embodied in other forms, and it is also to be under stood thatin and by the claims following the 7 description it is desired. tocover the invent1on in'whatsoever form it may be embodied.

In the accompanying: one sheet of drawings, Figure 1 is a plan view lookingdown into a dental device constructed in accordance with this invention and applied to the lower mandible. Figure 2 is anend view. of the same, V

In detail theconstruction illustrated in the drawings comprises'the base "plate 1, s'ub stantially ovalin plan, having the rounded ends 2 and 3 and transversely concavo-convex as shown in Figure 2. a The outer perimeter of the b ase plate is provided with a.

flange 4.110 aidin holding the impression 7 compound. within the base plate. It is also provided with the convenient handle 5 ex tending outwardly from the end 3 of the late. 1

This base plate is provided with a transverse hole through its center to pass the stem 6. The outer end of this stem is shouldered to providea rivet 7 for fixing. the compression-plate 8 on the end thereof. This compression plate is similar in contour and construction to the base plate 1, and is held in juXta-position thereto by the stem 6. It is similarly transversely concavo-convex and has the flange 9 around its perimeter for the purpose of retaining the plastic impression mass. These plates, 1 and 8, will vary more or less in contour and shape as they are made in various sizes to fit particular locations in the mouth of the patient, and are appropriately shaped to meet the anatomical condi-. tions at thesevarious points without departing materially from the major characteristics of the plates shown in the drawings. The opposite end of the stem 6 is flattened and pivoted at 10 to the toggle lever 11 that pivoted in the stud 16 rising from the base plate at the opposite end. The handle lever is provided with a convenient handle 17 in' juxta-position to the handle 5. The toggle action just described causes the COI'HPIESSIOD plate 8 to advance toward the base plate 1 when the handles 5 and 1'? are pinched between the thumb and lingers of the operator. The various parts of the device should be made of such material, and finished and shaped, to facilitate cleaning and sterilizing;

This invention is operated substantially as follows: The operator takes a mass of plaster, wax or other plastic impression com pound and forces it between the plates 1 and 8, which are forced apart thereby until the handles '5 and 17 separate as shown in Figure '1, the impression compound surrounding the stem 6 and fitting withinthe flanges 4; and 9. The device then inserted between the aws of: the patient with the impression compound between the teeth of the upper and lower jaws, the stem 6 being adjusted to pass into the gap in the upper or lower jaw, as the case may be, where the tooth to be, re olaced is missing, see Figure 1. The patient is then instructed to bite into the impression compound until his teeth meet, in the usual manner. The impression co1npound displaced by the entrance of the teeth thereinto flows out past'the plates 1 and 8, forming a cup like depression surrounding the various teeth embedded in the impression compound. After the patient has bitten into the impression compound the required dis tance and moved his jaws to insure a perfect occlusion between his upper and lower teeth, he is instructed to hold the bite hard in posi- 'tion while the operator pinches the handles Sand 17 between his fingers, which shortens the distance bet-ween the base plate 1 and the compression plate 8, compressing the interstices between.

compound therebetween laterally against the sides of the teeth embedded therein, perfecting a lateral impression of the teeth and the While the operator holds the handles 5 and 17 the patient is instructed to withdraw his teeth from the impression compound which leaves a perfect impression of the occlusion'and also of the sides of the various teeth below the line of the bell and above the occlusive surfaces.

The device is then removed from the mouth of the patient, the excessive impression com-' pound trimmed off and theoperator has a perfect mold of the teeth involved in the futuremechanical operations, and he proceeds with the usual mechanicaltechnique indicated by the conditionsto be met.

Having thus" described this invention what I claim and desire to secure by Letters Patent is: V '1. A dental device comprising a base plate; a stem passing through said base plate; a compression plate fixed upon said stem; a toggle mounted upon said base plate and engaging said stem.- 2. A dental device comprising i a base plate; a stem passing through said base plate; a compression plate fixed upon said stem; a toggle lever pivoted to said base plate and said stem and a handle lever pivoted to said base plate and said toggle lever. j

In testimony whereof I have hereunto afiixed my signature. 7.

JOEL WILDER, JR. 

